John; This may be a good follow-on to the previous
issue. I don't know much about how Sesame endpoints work. They
could do 1) give each named graph their own named endpoint, or 2)
have a single endpoint for the repository and require a URI to
access the named graph (some repositories, including Sesame, have
a default graph that is separate from the named graphs, but can be
accessed without a named graph URI).
If the "Named graph" entry doesn't matter, then I'd guess it's 1),
and all you need is the URL of the SPARQL endpoint. But you may want to look that up with
Sesame documentation. If it's 2, then it depends on
whether you are accessing the default graph or a named graph.
Again, Sesame has a default graph that is separate from the named
graphs. So it depends on where your data is as to which one you
fill in.
As an example, I have included a connector to the
TopBraid/Examples/kennedys.ttl file thorough the TBC-ME personal
server. Note that it uses the Default graph URI to specify the
named graph in TBS's SPARQL endpoint. You should be able to try
this out on your TBC-ME.
-- Scott
On 10/2/2012 5:45 PM, John Perdoni
wrote:
Hi I am having trouble creating a connection to a
Sesame Sparql endpoint (which is on http:localhost:9090)
Using the import wizard I fill in the following parameters
Connection file name
wordSparqlEndpoint
Base URI(for imports)
http://example.com/library/word
URL of the SPARQL endpoint
http://localhost:9090/openrdf-sesame/repositories/word
(username and password I have tried with or without but does not
make any difference)
Default graph URI
http://example.com/library/word
Named graph either left blank
or with http://notExample.com/otherCompany/#Data (does not make
any difference)
The wizard completes fine with no errors, but upon trying to
import this connection into another model/graph I get the
following error
HttpException: HttpException: 400 Bad Request: HttpException: 400
Bad Request
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:337)
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:189)
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:144)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:133)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind1(SPARQLEndpointGraph.java:309)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind1(SPARQLEndpointGraph.java:350)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind1(SPARQLEndpointGraph.java:350)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind1(SPARQLEndpointGraph.java:350)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind1(SPARQLEndpointGraph.java:350)
at
org.topbraid.sparqlendpoint.graph.SPARQLEndpointGraph.doFind(SPARQLEndpointGraph.java:288)
at
org.topbraid.core.graph.AltGraphBase.graphBaseFind(AltGraphBase.java:31)
at
com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:240)
at com.hp.hpl.jena.graph.GraphUtil.findAll(GraphUtil.java:29)
at
com.hp.hpl.jena.graph.impl.GraphBase.graphBaseSize(GraphBase.java:379)
at
com.hp.hpl.jena.graph.impl.GraphBase.size(GraphBase.java:352)
at
org.topbraid.sparqlendpoint.graphstore.SPARQLEndpointGraphStore.load(SPARQLEndpointGraphStore.java:93)
at
org.topbraid.core.registry.IFileGraphSource.graphStoreLoad(IFileGraphSource.java:66)
at
org.topbraid.core.registry.IFileGraphSource.loadSpecialGraph(IFileGraphSource.java:45)
at
org.topbraid.core.registry.GraphSource.loadGraph(GraphSource.java:77)
at org.topbraid.core.io.IO.load(IO.java:267)
at
org.topbraidcomposer.core.io.TBCIO.loadModel(TBCIO.java:289)
at
org.topbraidcomposer.core.io.TBCIO.loadModel(TBCIO.java:318)
at
org.topbraidcomposer.core.models.Imports.addImport(Imports.java:69)
at
org.topbraidcomposer.navigation.imports.actions.ImportFileAction$1.run(ImportFileAction.java:87)
at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: HttpException: 400 Bad Request
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:299)
... 24 more
However if I use the following Sparql from TBC all works, so I
know the endpoint is there and functioning , what am I doing wrong
with regards to the wizard
PREFIX word: <http://example.com/library/word#>
SELECT *
WHERE {
SERVICE
<http://localhost:9090/openrdf-sesame/repositories/word>
{ ?subject a <http://example.com/library/word#word> .}
Regards
John
}
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|
# baseURI: http://topbraid.com/KennedysEndpoint
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix sml: <http://topbraid.org/sparqlmotionlib#> .
[] rdf:type sml:ImportSPARQLEndpoint ;
sml:baseURI "http://topbraid.com/KennedysEndpoint"; ;
sml:defaultGraphURI "http://topbraid.org/examples/kennedys"; ;
sml:imports () ;
sml:namedGraphURI "" ;
sml:url "http://localhost:8083/tbl/sparql"; ;
sml:userName "" .
